Module selection

State management for a selection in the grid

A selection should start when the mouse is clicked, and it should be finalized when the button is released. The selection should be cleared when text is added/removed/scrolled on the screen. The selection should also be cleared if the user clicks off of the selection.

Structs

• Anchor
  A Point and side within that point.
• Selection
  Describes a region of a 2-dimensional area.
• SelectionRange
  Represents a range of selected cells.